#5412: dataTypeConstrs gives unhelpful error message
---------------------------------+------------------------------------------
Reporter: NeilMitchell | Owner:
Type: bug | Status: new
Priority: normal | Component: libraries/base
Version: 7.1 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Take the following program:
{{{
import Data.Data
foo = dataTypeConstrs (dataTypeOf (0 :: Int))
-- raises: *** Exception: Data.Data.dataTypeConstrs
}}}
The implementation of {{{dataTypeConstrs}}} has the type available as a
string at this point, so could easily say:
{{{Exception: Data.Data.dataTypeConstrs is not supported for Int, as it is
not an algebraic data type}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5412>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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